function Foo() {
    getName = function () {
        console.log(1)
    }
    return this;
}

Foo.getName = function () {
    console.log(2)
}

Foo.prototype.getName = function () {
    console.log(3)
}

var getName = function () {
    console.log(4)
}

function getName() {
    console.log(5)
}

Foo.getName(); //2 
getName();//4
Foo().getName(); //1
getName() //1
new Foo.getName(); //2
new Foo().getName(); //3
new new Foo().getName() //3